Centrifugal concentrator.



M. P. BOSS.

CENTRIFUGAL GONGENTRATOR.

APPLICATION FILED MAB. 7, 1911. 1,071,870.

- Patented Sept. 2, 1913.

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w Imam I or M. P. BOSS.

OENTRIFUG'AL OONGENTRATOR.

APPLIOATIONJILED MAR. 7, 1911.

1 ,071 ,870, Patented Sept. 2, 1913.

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WI 2551i? IH/ EHTEF UNITED STATES PATENT OFFICE.

MARTIN PRIOR BOSS, OF SAN FRANCISCO, CALIFORNIA.

CENTRIFUGAL CONCENTRATOR.

To all whom 2' t may concern:

Specification of Letters Patent.

Application filed March 7, 1911.

Be it known that 1, MARTIN P. Boss, a?

citizen of the United States, residing in the city and county of San Francisco and State.

of California, have invented certain new and useful Improvements in Centrifugal Concentrators, of which the following is a specification.

My invention relates to the class of centrifugal concentrators, especially adapted for separating precious metals from their associated materials.

The object of my invention is to provide a simple and effective machine of thls class, and to this end my invention consists in the novel centrifugal concentrator and in the construction, arrangement and combination of its parts, which I shall hereinafter fully describe and claim.

Referring to the accompanying drawings--Fi-gure 1 is a partial plan, broken, of my concentrator. Fig. 2 is an elevation of my concentrator, one side of the separating basin being in section. Fig. 3 is a sectional detail, enlarged, of the basin, showing the operation of the machine.

l is the vertical driver, suitably stepped in a bearing 21below, and carrying a pulley 3 for the application of the driving power. On the top of the driver is a head flange 4 which carries the concentrator basin. This basin is composed of an outer pan 5, in the inner surface of the circumferential rim of which is a series of pockets 6 apexed outward, each pocket having at its apex point a radial discharge spigot 7 Bolted on top of the rim of the outer pan 1, is a crown ring 8, which shelves inward as shown at 9. Beneath the shelf 9 is the rim of the inner pan 10. Wearing rings 11 and 11, preferably of steel, are attached, one to the rim of the inner pan, and one to the crown ring 8, the relative positions being such that between these rings is left an annular relatively narrow open space 12, which said space is adjustable in width by means of the stud bolts 13 and set screws 14 which connect the inner and outer pans.

The annular space 15 between the two pans serves as a waterchamber, and as it entirely encircles the inner pan, and as the bottom of the inner pan is also separated from the bottom of the outer pan, as shown at 16, it follows that if, when the machine is in action, water be turned into the waterl atented Sept. 2, 1913.

Serial No. 612,876.

feed space 17 between the hub 18 of the outer pan and the hub 19 of the inner pan, and said water he in excess of the capacity of the spigots 7, such excess will flow inward through the annular space 12 between the wearing rings 11 and 11. The force of this inward flow is regulatable by adjustment of the water feed, and thereby the counterbalancing or over balancing wall of water within :the chamber 15 varies inward or outward to accord with the inflow.

Sleeved around the hub 19 of the inner pan 10 is a hopper 20 for the pulp feed, adapted to deliver the pulp evenly to and distribute it within the inner pan 10 near the bottom, where it is thrown ccntrifu gally outward into an annular recess 21 made in the rim of said pan, in which recess the pulp becomes accelerated to the speed of the machine at that point. This recess 21 is beneficial also in protecting the iron from wear in that it can carry an accumulation of sand. This sand I have indicated at 22, in Fig. 3, in which said figure, I l ave shown the operation of the machine. The pulp, indicated by 28, overflows from the recess 21 in a .thin even sheet, as shown in Fig. 3, and as it moves upward it expands over the conical surface until it meets the ledge 9 formed by the inward shelving of the crown ring 8 and its wearing ring 11, and in the recess formed by this ledge it meets the counter-flow of excess water from the body of water 24, said flow proceeding between the wearing rings 11 and 11. By the proper adjustment of water this flow has force enough to carry the lighter particles over the ledge or shelf 9 of the crown ring, and these particles, as shown at 25, will proceed vupward over the conical inner surface of the impedes the outflow and lessens the frictional wear.

Having thus described my invention what I claim as new and desire to secure by Let 'ters Patent ispan separated from the outer pan to provide a water chamber between the two pans; and a crown ring on the top of the outer pan and shelving inwardly over and beyond the rim of the inner pan, and separated from the top of saidrim to provide an annular space for the outflow of the concentrates separated from the'pulp fed to said inner pan, against'the inflow of an excess of water supplied to the water chamber, said crown ring having a conical inner wall with a continuous outward slope from its lower to its upper edge. 4

2. In a centrifugal concentrator, a revolving separating basin comprising an outer pan having peripheral discharges; an inner pan separated from the outer pan to provide a water chamber between the two pans; and a crown ring on the top of theouter pan and shelving inwardly over and beyond the rim of the inner pan, and separated from the top of said rim to provide an annular space for the outflow of the concentrates separated from the pulp fed to said inner pan, against the inflow of an excess of water supplied to the water chamber, said inner pan having in the lower part of its rim an annular recess for accelerating and evenly distributing the pulp, said crown ring having a conical inner wall with a continuous outward slope from its lower to its upper edge.

3. In a centrifugal concentrator, a re volving separating basin comprising an outer pan having formed in the inner face of its rim an annular series of pockets apexed outward with an outward discharge through said rim from the apex of each pocket; an inner pan separated from the outer pan to provide a water chamber be tween the two pans; and a crown ring on the top of the outer pan and shelving inwardly overand beyond the rim of the inner pan, andseparated from the top of said rim to providean annular space for the outflow of the concentrates separated from the pulp fed to said inner pan, against the inflow of an excess of water supplied to the water chamber, said crown ring having a' conical inner wall with a continuous outward slope from its lower to its upper edge.

4. In a centrifugal concentrator, a revolving separating basin comprising an outer pan having peripheral discharges; an inner pan separated from the outer pan to provideaj'water chamber between the two pans; a crown ring on the top of the outer pan and shelving inwardly over and beyond the rim of the inner pan and separated from the top of said rim to for the outflow o rated from-the pul against the inflow of an excess of water su plied to the water chamber; and means a the concentrates sepaprovide an annular space fed to said inner pan, 7

ustabIy connecting the bases of the two pans by the adjustment of which the width of the annular space for the outflow of the; concentrates may be varied.

5. In a centrifugal concentrator, a revolving separating basin comprising an outer '75 pan having peripheral discharges; an inner pan separated from the outer pan to provide a water chamber between the two pans; a crown ring on the 'top of the outer pan and shelving inwardly over and beyond the rim of the inner pan, and-separated from the top of said rim toprovide an annular space for vthe outflow of the concentrates separated from the pulp fed to said inner pan, against the inflow of an excess of water supplied to the water chamber, said crown ring having a conical inner wall with a continuous outward slope from its lower to its upper edge; and means for adjusting the crown ring relatively to the top of the rim of the inner pan to vary the width of the space between them.

6. In a centrifugal concentrator, a revolving basin the walls of which flare upward,

said basin having on the inner surface of its wall an inwardly projecting annular shelf and directly below said shelf an annular opening through said wall and said basin having also a central hub; a hopper within said basin concentric and spaced MARTIN, PRIOR BOSS.

Witnesses W. B. Conn, W. A. KIDNEY. 

